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State machines also have a wide range of uses in game development, especially the logic writing of game AI. The main characters in the game have various states such as walking, attacking, defending, falling and jumping. These states are both interrelated and constrained. For example, if attacked during walking, it will switch from walking state to falling state. In the state of falling, it can neither attack nor defend. Similarly, you cannot switch to the defensive state during the jump, but you can attack. This kind of scenario is very suitable to be described by state machine. The code is as follows:3. Li Yifeng余者都做普通兵士。这是一个反映生活的三⻆Love story。即将错过“结婚适龄期”，年近30的柏崎悠与男友·尚纪交往七年，同居五年。他们过着日复一日、千篇一律的生活，却始终无法迈进婚姻，悠开始为此感到焦躁。就在悠的生日这天，她与男友发生了一些不快，愤然离家。回到老家，正在气头上的悠偶遇了高中时交往过的前男友……面对现男友与前男友，为了幸福的婚姻，悠会如何抉择?The core idea is: when the state of the object changes, it changes its behavior at the same time, which is very understandable! Take QQ for example. There are several states, online, invisible, busy, etc. Each state corresponds to different operations, and your friends can also see your state. Therefore, the state mode is two points: 1. You can obtain different behaviors by changing the state. 2. Your friends can see your changes at the same time. Look at the picture:西汉年间，孤苦无依的孪生姐妹赵飞燕、赵合德二人，流落长安街头以编织草鞋艰难度日。飞燕姐妹因其貌美，被当朝天子汉成帝的表妹阳阿公主收入府中，教习歌舞。汉成帝驾临公主府观赏歌舞，对飞燕的美貌和出色舞技大为倾倒，决意将其带回宫中……